Oven with closure mechanism

ABSTRACT

An oven provided with inner and outer doors arranged so that when both doors are registered with the oven opening to cover the opening the inner door is disposed inwardly of the oven from the outer door to reflect oven heat from the outer door, and the two doors being so connected that movement of the outer door to and from a position covering the opening automatically and concurrently causes the inner door to correspondingly move to and from a position covering the opening.

United States Patent [15] 3,655,942 Tomsic [45] Apr. 11, 1972 [s41 OVENWITH CLOSURE MECHANISM 2,688,685 9/1954 Goodell ..219/405 x 72]Inventor: Raymond F. Tomsic, Willoughby, Ohio gggg'gfi :33: azg g [73]Assignee: Spectrum Infrared, Inc Cleveland, Ohio 3,564,202 2/ 1 97!Oppenheim ..219/400 221 Med: 1971 Primary Examiner-Velodymyr Y. Mayewsky[2 1] App]. No.: 123,780 Attorney-Woodling, Korst, Granger and Rust 52us. or ..219/405, 49/145, 219/399, [571 ABSTRACT 2 19/41 11 312/138 Anoven provided with inner and outer doors arranged so that [5 l 1 Int-..F27d when doors are regisered the oven opening to cover [58] Field ofSearch ..219/399, 400, 405, 411; the opening the inner door is disposedinwardly f the oven 49/145, 312/138, 1 273 from the outer door toreflect oven heat from the outer door. 56 R f ed and the two doors beingso connected that movement of the l 1 e memes outer door to and from aposition covering the opening auto- UNITED STATES PATENTS maticaliy andconcurrently causes the inner door to cor- R 24 296 3/1957 Stewart219/405 X respondmgly move to and from a pos1t1on covering the opene 1n1,098,695 6/1914 Stoiper ..49/145 g v 2,293,536 8/1942 Fenn ..49/145 15Claims, 10 Drawing Figures PATENTEDAPR n 1912 4 3,655,942

SHEET 1 OF 2 mmumml1unuummuuunnnnn F3 Ti H u INVENTOR. P4 YMOND F,TOMS/C BYMAZ 7w ATTOENEYS.

PAIENTEDAPR 11 I972 3. 555.942

INVENTOR. QAY/ IOND F". TOMS/C Ma ATTORNEYS.

OVEN WITH CLOSURE MECHANISM An object of my invention is to protect theouter door of an oven from heat generated in the oven by an inner doorthat automatically is positioned inwardly of the outer door by movementof the outer door to a position covering the oven opening to therebyreflect heat from the outer door at such position.

Another object is the provision for operating an inner door to and fromposition to cover an oven door automatically by the manual movement ofthe outer door so as to interpose the inner door between the outer doorand the interior of the oven when the outer door is in position to closethe opening and thereby reflect heat generated in the interior of theoven away from the inner surface of the outer door.

Another object is to provide unique mechanism for operating an innerdoor of an oven by the movement of the outer door of the oven, toprovide for two parallel, spaced and aligned doors at the oven openingfor covering the opening and to provide for simultaneous clearance ofthe oven opening by the doors. I

Other objects and a fuller understanding of this invention may be had byreferring to the following description and claims, taken in conjunctionwith the accompanying drawings, in which:

FIG. 1 is a front elevational view of an oven embodying a preferred formof my closure mechanism;

FIG. 2 is a side elevational view of the oven shown in FIG. 1;

FIG. 3 is a longitudinal sectional view of the oven taken through theline 3-3 of FIG. 1;

FIG. 4 is a detailed cross-sectional view taken line 4-4 of FIG. 3;

FIG. 5 is a partial view in section illustrating the preferred formof myclosure mechanism in the closed positions of the inner and outer doors;

FIG. 6 is a view similar to that of FIG. 5 but with the inner and outerdoors shown in their opened positions;

FIG. 7 shows a modified form of my closure mechanism in the closedpositions of the inner and outer doors;

FIG. 8 is a view similar to that of FIG. 7 but with the inner and outerdoors in opened positions;

FIG. 9 shows a modified form of my closure mechanism in the closedpositions of the inner and outer doors; and

FIG. 10 is a view similar to that of FIG. 9 but with the inner and outerdoors in opened positions.

With reference to the figures in the drawings, my closure mechanism isparticularly adapted for ovens such as, for example, an oven having ahousing 11. This oven may, for example, be of the type in which foodsuch as sandwiches are heated by infrared heating generated fromelectrically energized quartz tubes of well known structure andfunction.

The housing 11 is in the form of a rectangular metal box having top,bottom, rear and side walls of metal. The front of housing 11 has anupper front panel portion 11A and a lower front panel portion 11B.Intermediate the portions 11A and 11B is an open space providing theopening 11C which gives ingress into the interior of the oven forplacing objects to be heated therein and for removal of the objectsafter being heated.

A timer mechanism, not shown, is mounted in the housing for pre-settingthe heating periods of the oven. A timer dial 16 is shown on the lowerpanel 118.

Mounted to the housing 11 and disposed within it is an inner shell 12having surfaces facing inwardly which are of a reflective nature so asto reflect heat energy inward of the oven. This inner shell 12 has adomed upper portion 12A, side wall portion 128 and a cup-shaped bottomportion 12C.

Electrically energizable quartz tubes adapted to generate infrared heatenergy are mounted within the inner shell 12, with tubes 14 being in theupper portion 12A and tubes 15 being in the lower portion 128. Suitableelectrical connections, not shown, are provided for electricallyenergizing the tubes 14 and 15. A rack 13, of open mesh construction, ismounted within the shell 12 to support in the interior of the ovenintermediate of upper tubes 14 and lower tubes 15 objects to be heated,such as sandwiches for example.

through the Hingedly mounted by means of hinge 18 to the front of thehousing, along the upper edge of lower panel 118, is an outer door 17.The mounting is such that the door 17 may be swung upwardly to avertical plane so as to cover the opening 11C, or alternatively swungdownwardly to uncover the opening 11C. In FIGS. 3 and 5, the outer door17 is shown in its vertical position covering or closing the opening11C. In FIG. 6, the door 17 is shown in its horizontal position and inwhich the opening 11C is uncovered. This horizontal position of door 17is indicated in broken lines in FIG. 3. A handle 19 is mounted to outerdoor 17 for facilitating the manual movement of the door 17.

Suitable switching mechanism, not shown, is provided in the oven fordeenergizing the tubes 14 and 15 when the outer door 17 is swungdownwardly to uncover the opening 11C. This is highly desirable toprevent direct heat energy from being directed out of opening 11C by thetubes 14 and 15 with consequent waste and unwanted dissipation of heat.Also, it adds to the safety in use of the oven should the operatorinadvertently insert his hand into the oven.

Because of the intense heat that may be generated in such an oven, itis' highly desirable to protect the outer door 17 from the heatgenerated within the oven by tubes 14 and 15 when the outer door is upto cover the opening 11C. I provide for automatically protecting theouter door 17 from such heat by an inner door 20which concurrently movesto cover the opening 11C when the outer door 17 is moved up to closed orcovering position. This inner door 20 has a reflective surface on theside facing the interior of the shell 12 and thus reflects from theouter door 17 the heat directed thereto from the interior of shell 12.The inner door 20 is in the form of a flat sheet of reflective metal andof a size to register with opening 11C and to be interposed between theouter door 17 and the interior of the shell. Preferably there is a smallair space between the inner and outer doors when in their closedpositions to minimize transfer of heat from the inner door 20 to outerdoor 17. In this manner, the outer door 17 is maintained at a relativelycool temperature and much lower than it would be in the absence of suchan inner door 20. Without such protection from the heat as afforded bythe inner door 20, the outer door 17 would tend to become excessivelyhot and there would be considerable danger of the hand of the operatorof the oven becoming burned from touching the door 17 and handle 19.

To provide for the automatic actuation of the inner door 20 concurrentlywith the movement of the outer door 17, I provide a novel actuatingmechanism. An arm member 24 is rigidly secured by rivets 25 to a sideflange of outer door 17 so as to extend at an acute angle to the planeof outer door 17 as shown. When outer door 17 is in its upper closedposition, this arm 24 extends downwardly and inwardly as illustrated inFIGS. 3 and 5. A link member 27 is pivotally connected at one of itsends by a pivot pin 26 to the free end of arm 24. The other end of linkmember 27 is pivotally connected by a pivot pin 28 to a mounting bracket29 firmly secured to inner door 20 as shown in FIGS. 3, 5 and 6.

A vertical guiding groove 22 is provided for guiding vertical up anddown movement of inner door 20 by means of a vertically mounted flangemember secured to the side wall of housing 11. This groove assuresmovement of inner door 20 in a vertical plane. The side edge of innerdoor 20 fits in the groove 22 provided by flange member 21 and the sideflange portion of panel portions 1 1A and 1 1B.

The action of the actuating mechanism is such that upon the outer door17 being swung down in open position uncovering the opening 11C theinner door is automatically carried vertically upward to open positionalso uncovering the opening 11C. In this manner free access is providedto the interior of shell 12 unhindered by doors l7 and 20. However, uponswinging the outer door upwardly to cover the opening 11C the sameactuating mechanism vertically moves the inner door downwardly to closedposition covering the opening 11C, and thus concurrently with outer door17 to register with opening 11C, and thereby protect outer door 17 fromdirect emanation of heat rays directed from within the shell 12.

In the modified form of FIGS. 7 and 8, an arm 31 also rigidly secured toouter door 17 is somewhat similar to arm 24 of the preferred from shownin FIGS. 1 to 6, inclusive. However, on the free end of arm 31 there isrotatively mounted a roller 32. A camming plate 33 is rigidly secured toinner door 20 along a side edge thereof, and preferably integrallyformed with inner door 20. This carnming'plate is pivotally carried by apivot pin 35 secured to the side wall of housing 11. A camming slot 34is provided in camming plate 33 and the roller 32 is accommodated in theslot 34. The arrangement is such that roller 32 may rollingly move inslot 34 and cause the plate 33, carrying inner door 20, to pivotallyswing about the pivot pin 35.

In this modified form of FIGS. 7 and 8, the inner door 20 is swung in anare about pin 35 by the camming action of roller 32 in slot 34 upon thearm 31 swinging with the movement of outer door 17. When the outer door17 is swung up to closed position to cover the opening 11C, as shown inFIG. 7, the inner door 20 is automatically and concurrently moved to itsclosed position covering the opening 11C, also as shown in FIG. 7. Whenthe outer door 17 is swung down as shown in FIG. 8, the inner door 20 isautomatically and concurrently swung up,also as shown in FIG. 8. In thismodified arrangement of FIGS. 7 and 8 it is necessary to assuresufficient head room or over-head space in shell 12 for accommodatingthe upwardly swung inner door 20.

In the still further modified form of the mechanism shown in FIGS. 9 and10, there is a rigid arm 37 secured by rivets 25 to a side flange ofouter door 17. This rigid arm 37 differs from arm 24 of the preferredform of mechanism shown in FIGS. 1 to 6, inclusive, in that it extendsvertically downwardin the closed position of outer door 17 as shown inFIG. 9. A pivot pin 38 is carried on the free end of arm 37. A linkmember 39 has one end pivotally connected by pivot pin 39 to the freeend of arm 37 and its other end pivotally connected by pivot pin 40 to arigid arm 41 rigidly secured to, and extending at a right angle to theinner door 20 at a side edge thereof. The end of rigid arm 4l at adistance from inner door 20 is pivotally carried by a pivot pin 42secured to a side wall of housing 1 1.

' The action of the modified mechanism shown in FIGS. 9

and is such that when the outer door 17 is swung up to cover the opening11C, the inner door is automatically and concurrently swung down to alsocover the opening 11C, as illustrated in FIG. 9. However, upon the outerdoor 17 being swung downwardly to uncover the opening 11C, the innerdoor is automatically and concurrently swung up in an are about thepivot pin 42 to uncover the opening 11C, as illustrated in FIG. 10.

As in the case of the form of arrangement shown in FIGS. 7 and 8, it isalso necessary to assure sufficient head room or over-head space for theupwardly swinging inner door in the form illustrated in FIGS. 9 and 10.

Although I have shown and described, in connection with all arrangementsshown in all of the figures, but one actuating mechanism disposed on oneside of opening 11C, it should be understood that preferably thereshould be a similar actuating mechanism on the other side of opening11C. In other words, it is preferable for best operations that there befor each oven a pair of similar actuating mechanisms spaced apart anddisposed on opposite sides of opening 1 1C and along both the verticalside edges of the inner and outer doors. For example, in the preferredform of FIGS. 1 to 6, inclusive, there would be a pair of likeassemblies of parts 24, 26, 27, 28 and 29, with a pair of spaced grooves22, along the opposed vertical edges of opening 1 1C, outer door 17 andinner door 20.

My improved mechanism has provided for improved safety, greater economyin operation, and more efiiciency in the operation of such ovens. Y

The present disclosure includes that contained in the appended claims,as well as that of the foregoing description.

Although this invention has been described in its preferred form with acertain degree of particularity, it is understood that the presentdisclosure of the preferred form has been made only by way of exampleand that numerous changes in the details of construction and thecombination and arrangement of parts may be resorted to withoutdeparting from the spirit and the scope of the invention as hereinafterclaimed.

What is claimed is:

1. In an oven having a housing, electric heating means, and aspacewithin the housing heatable by the heating means, said housing having anopening therein for providing access to within the housing for theinsertion of objects to be heated within said open space and for removalof the objects therefrom, closure mechanism comprising the combinationof an outer door hingedly carried by said housing at said openingproviding for covering said opening at one position of the outer doorand for uncovering said opening at a second position of the outer doorupon pivotal swinging said outer door,

. an inner door positionable at a first location at said opening andinward of the housing from said outer door, said inner door beingmovable from said first location at said opening to a second positionclearing said opening for access to said open space, said inner doorupon being positioned at said opening and inwardly of said outer doorbeing adapted to reflect inwardly of the housing heat directed towardsaid outer door from said heating means in the housing, guide meanscarried by the housing for guiding movement of said inner door betweensaid first and second positions, and linkage means operativelyconnecting said outer door and said inner door to cause movement of saidinner door between said first and second positions upon the pivotalswinging of said outer door between said positions of covering anduncovering said openmg.

2. The heating oven as claimed in claim 1 and in which said guide meansare disposed to guide the said inner door in a generally vertical planeas it moves between said first and second positions.

3. The heating oven as claimed in claim 2 and in which said outer dooris hingedly connected to the housing adjacent the bottom edge portion ofthe'outer door, pivotally swings upwardly toward a vertical plane inmoving to position covering said opening, and pivotally swings toward ahorizontal plane in moving to position uncovering said opening.

4. The heating oven as claimed in claim 3 and in which said linkagemeans includes a first arm rigidly connected to said outer door to swingin an are upon pivotal swinging of the outer door, and a second armhaving one end hingedly connected to said inner door and a second endhingedly connected to the free end of the first arm swingable in an arcto translate swinging movement of the outer door to linear movement ofsaid inner door.

5. In an oven having a housing, electric heating means, and a spacewithin the housing heatable by the heating means, said housing having anopening therein for providing access to within the housing for theinsertion of objects to be heated within said open space and for theremoval of objects therefrom, closure mechanism comprising thecombination of an outer door carried by the housing at said opening tocover and uncover said opening upon movement of said outer door betweenclosed and open positions, an inner door carried by the housing at saidopening inwardly of the housing from said outer door to cover anduncover said opening upon movement of said inner door between closed andopen positions, said inner door being disposed inwardly of the outerdoor to reflect heat from said outer door directed toward the same fromsaid open space in the housing upon both said inner and outer doorsbeing concurrently in positions to cover said opening, and actuatingmeans operatively interconnecting said inner and outer doors to causesaid inner door to move to position covering said opening upon the outerdoor being moved to position covering said opening, and to cause saidinner door to move to position uncoveringsaid opening upon the outerdoor being moved to position uncovering said opening.

6. The heating oven as claimed in claim 5 and in which said inner doorlinearly moves in a general vertical plane, and in which said outer doorpivotally swings in an are between a general vertical plane and ageneral horizontal plane.

7. The heating oven as claimed in claim 5 and in which said inner doorpivotally swings in an are about a pivot disposed inward of the housingat a distance from said outer door.

8. The heating oven as claimed in claim 5 and in which said actuatingmeans includes linkage means operatively connecting the inner and outerdoors, and in which said inner door moves upwardly to a positionuncovering said opening simultaneously with the downward movement of anedge portion of the outer door to a position in which the outer dooruncovers said opening.

9. In an oven having a housing, electric heating means, and a spacewithin the housing heatable by the heating means, said housing having anopening therein for providing access to within the housing for theinsertion of objects to be heated within said open space and for theremoval of objects therefrom, closure mechanism comprising thecombination of an outer door, a hinged connection connecting the loweredge portion of the outer door to said housing adjacent said opening,said outer door being adapted to be pivotally swung upwardly to coversaid opening and to be pivotally swung downwardly and outwardly touncover said opening, an inner door positioned inwardly of the housingadjacent said opening and movable to a position covering said openingand to a position uncovering said opening, said inner door having asurface adapted to face said open space and to reflect from said outerspace heat directed toward said outer door from said space in thehousing upon both the inner and outer doors being in posi tions,respectively, to cover said opening, and actuating means operativelyconnecting said inner and outer doors to cause said inner door to moveto position covering said opening concurrently upon the movement of saidouter door to position covering said opening whereby to reflect heataway from the outer door at the position covering said opening, and tocause said inner door to move to position uncovering said openingconcurrently upon the movement of said outer door to position uncoveringsaid opening whereby to clear said opening for access to said spacewithin the housing.

10. The heating oven as claimed in claim 9 and in which said actuatingmeans includes linkage means connecting the inner and outer doors andguide means for guiding the movement of said inner door.

11. The heating oven as claimed in claim 9 and in which said actuatingmeans moves the inner door in a generally vertical plane.

12. The heating oven as claimed in claim 9 and in which said actuatingmeans moves said inner door to swing in an arc about a pivot spacedinwardly of the housing from the hinged connection of the outer doorwith said housing.

13. Closure mechanism for an oven having a housing and an opening in thehousing to provide access to the interior of the housing where heat isto be generated, said mechanism comprising in combination a movableouter door and a movable inner door carried by the housing, both saiddoors in their closed positions being adapted to register with saidopening and to be disposed in alignment with each other, said doors intheir respective closed positions being substantially parallel to eachother and spaced from each other, the inner door having a surface facingthe interior of the housing to reflect from the outer door heatgenerated in the housing when both doors are in their closed positions,each of said doors being movable from said opening to clear said openingactuating means operatively connecting said inner and outer doors tocause said inner door to be moved by, and concurrently with, movement ofsaid outer door, the movement of the outer door away from said openingto clear the same also moving the inner door away from said opening toclear the same, and the movement of the outer door to closed position atsaid opening also moving the inner door to closed position at saidopening.

14. Closure mechanism as claimed in claim 13 and including guide meanscarried by the housing for guiding movement of said inner door in asubstantially vertical path, and hinge means carried by the housinghingedly connecting the outer door to the housing for permitting pivotalswinging of the outer door between substantially vertical andsubstantially horizontal planes.

15. Closure mechanism as claimed in claim 13 and in which said actuatingmeans includes means interconnecting the inner and outer doors to causesaid inner door to swing in an arc upwardly to clear the opening uponthe outer door being moved to position to clear said opening.

1. In an oven having a housing, electric heating means, and a spacewithin the housing heatable by the heating means, said housing having anopening therein for providing access to within the housing for theinsertion of objects to be heated within said open space and for removalof the objects therefrom, closure mechanism comprising the combinationof an outer door hingedly carried by said housing at said openingproviding for covering said opening at one position of the outer doorand for uncovering said opening at a second position of the outer doorupon pivotal swinging said outer door, an inner door positionable at afirst location at said opening and inward of the housing from said outerdoor, said inner door being movable from said first location at saidopening to a second position clearing said opening for access to saidopen space, said inner door upon being positioned at said opening andinwardly of said outer door being adapted to reflect inwardly of thehousing heat directed toward said outer door from said heating means inthe housing, guide means carried by the housing for guiding movement ofsaid inner door between said first and second positions, and linkagemeans operatively connecting said outer door and said inner door tocause movement of said inner door between said first and secondpositions upon the pivotal swinging of said outer door between saidpositions of covering and uncovering said opening.
 2. The heating ovenas claimed in claim 1 and in which said guide means are disposed toguide the said inner door in a generally vertical plane as it movesbetween said first and second positions.
 3. The heating oven as claimedin claim 2 and in which said outer door is hingedly connected to thehousing adjacent the bottom edge portion of the outer door, pivotallyswings upwardly towArd a vertical plane in moving to position coveringsaid opening, and pivotally swings toward a horizontal plane in movingto position uncovering said opening.
 4. The heating oven as claimed inclaim 3 and in which said linkage means includes a first arm rigidlyconnected to said outer door to swing in an arc upon pivotal swinging ofthe outer door, and a second arm having one end hingedly connected tosaid inner door and a second end hingedly connected to the free end ofthe first arm swingable in an arc to translate swinging movement of theouter door to linear movement of said inner door.
 5. In an oven having ahousing, electric heating means, and a space within the housing heatableby the heating means, said housing having an opening therein forproviding access to within the housing for the insertion of objects tobe heated within said open space and for the removal of objectstherefrom, closure mechanism comprising the combination of an outer doorcarried by the housing at said opening to cover and uncover said openingupon movement of said outer door between closed and open positions, aninner door carried by the housing at said opening inwardly of thehousing from said outer door to cover and uncover said opening uponmovement of said inner door between closed and open positions, saidinner door being disposed inwardly of the outer door to reflect heatfrom said outer door directed toward the same from said open space inthe housing upon both said inner and outer doors being concurrently inpositions to cover said opening, and actuating means operativelyinterconnecting said inner and outer doors to cause said inner door tomove to position covering said opening upon the outer door being movedto position covering said opening, and to cause said inner door to moveto position uncovering said opening upon the outer door being moved toposition uncovering said opening.
 6. The heating oven as claimed inclaim 5 and in which said inner door linearly moves in a generalvertical plane, and in which said outer door pivotally swings in an arcbetween a general vertical plane and a general horizontal plane.
 7. Theheating oven as claimed in claim 5 and in which said inner doorpivotally swings in an arc about a pivot disposed inward of the housingat a distance from said outer door.
 8. The heating oven as claimed inclaim 5 and in which said actuating means includes linkage meansoperatively connecting the inner and outer doors, and in which saidinner door moves upwardly to a position uncovering said openingsimultaneously with the downward movement of an edge portion of theouter door to a position in which the outer door uncovers said opening.9. In an oven having a housing, electric heating means, and a spacewithin the housing heatable by the heating means, said housing having anopening therein for providing access to within the housing for theinsertion of objects to be heated within said open space and for theremoval of objects therefrom, closure mechanism comprising thecombination of an outer door, a hinged connection connecting the loweredge portion of the outer door to said housing adjacent said opening,said outer door being adapted to be pivotally swung upwardly to coversaid opening and to be pivotally swung downwardly and outwardly touncover said opening, an inner door positioned inwardly of the housingadjacent said opening and movable to a position covering said openingand to a position uncovering said opening, said inner door having asurface adapted to face said open space and to reflect from said outerspace heat directed toward said outer door from said space in thehousing upon both the inner and outer doors being in positions,respectively, to cover said opening, and actuating means operativelyconnecting said inner and outer doors to cause said inner door to moveto position covering said opening concurrently upon the movement of saidouter door to position covering said opening whereby to reflect heataway from the outer door at the poSition covering said opening, and tocause said inner door to move to position uncovering said openingconcurrently upon the movement of said outer door to position uncoveringsaid opening whereby to clear said opening for access to said spacewithin the housing.
 10. The heating oven as claimed in claim 9 and inwhich said actuating means includes linkage means connecting the innerand outer doors and guide means for guiding the movement of said innerdoor.
 11. The heating oven as claimed in claim 9 and in which saidactuating means moves the inner door in a generally vertical plane. 12.The heating oven as claimed in claim 9 and in which said actuating meansmoves said inner door to swing in an arc about a pivot spaced inwardlyof the housing from the hinged connection of the outer door with saidhousing.
 13. Closure mechanism for an oven having a housing and anopening in the housing to provide access to the interior of the housingwhere heat is to be generated, said mechanism comprising in combinationa movable outer door and a movable inner door carried by the housing,both said doors in their closed positions being adapted to register withsaid opening and to be disposed in alignment with each other, said doorsin their respective closed positions being substantially parallel toeach other and spaced from each other, the inner door having a surfacefacing the interior of the housing to reflect from the outer door heatgenerated in the housing when both doors are in their closed positions,each of said doors being movable from said opening to clear said openingactuating means operatively connecting said inner and outer doors tocause said inner door to be moved by, and concurrently with, movement ofsaid outer door, the movement of the outer door away from said openingto clear the same also moving the inner door away from said opening toclear the same, and the movement of the outer door to closed position atsaid opening also moving the inner door to closed position at saidopening.
 14. Closure mechanism as claimed in claim 13 and includingguide means carried by the housing for guiding movement of said innerdoor in a substantially vertical path, and hinge means carried by thehousing hingedly connecting the outer door to the housing for permittingpivotal swinging of the outer door between substantially vertical andsubstantially horizontal planes.
 15. Closure mechanism as claimed inclaim 13 and in which said actuating means includes meansinterconnecting the inner and outer doors to cause said inner door toswing in an arc upwardly to clear the opening upon the outer door beingmoved to position to clear said opening.